Hearing aid



FIG. 1 is a perspective view of a hearing aid, showing our new design in closed condition;

FIG. 2 is an exploded perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a cross-sectional view thereof taken along line 4--4 of FIG. 7;

FIG. 5 is a cross-sectional view thereof taken along line 5--5 of FIG. 7;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a front elevational view thereof;

FIG. 8 is a right side elevational view thereof;

FIG. 9 is a rear elevational view thereof; and,

FIG. 10 is a bottom plan view thereof. 

The ornamental design for a hearing aid, as shown and described. 